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| Characteristic | Total (%) |
|---|---|
| Biochemical markers (24 h urine 5-HIAA and/or serum chromogranin A) measured before and after 131I-MIBG treatment | 29 |
| >50% reduction of biochemical markers post-131I-MIBG therapy | 11/29 (36.7) |
| Radiological investigations performed before and after 131I-MIBG treatment | 40 |
| >25% reduction in tumour size demonstrated on post-131I-MIBG scans | 11/40 (27.5) |
| Symptomatic response to 131I-MIBG therapy | 27/48 (56.2) |
